William bueliistgham



(No Model.)

W. BURLINGHAM.

Pump Piston.

No. 237,430. Patented Feb. 8,1881.

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UNITED STATES PATENT @rrrcn.

WILLIAM BURLINGHAM, OF BALTIMORE, MARYLAND.

PUMPI-PISTON.

SPECIFICATION forming part of Letters Patent No. 237,430, dated February8, 1881.

Application filed December 30, 1880.

To all whom it may concern Be it known that 1, WILLIAM BURLING- HAM, ofBaltimore, county of Baltimore, State of Maryland, have invented new anduseful Improvements in Pump-Pistons, of which the following is a full,clear, and exact description, reference being bad to the accompanyingdrawings, making part of this specification, in which- Figure 1represents a vertical section through my improved plunger. Fig. 2 is asimilar section through the packing-rin g, detached. Fig. 3is a planview of the inner clampin g-rin g, and Fig. 4 represents a sectionthrough said ring on the line a: m, Fig. 3.

The present invention relates to an improvement upon the construction ofpump-pistons described in Letters Patent granted to me September 28,1880, No. 232,629 and it consists in the combination, in a pump-piston,of aflat perforated base-plate or disk, an annularlygrooved paokin g-ring resting thereon, an outer clamping-ring resting in the groove in thepacking-ring, and an inner peforated disk or ring for holding thepacking-ring engaged with the outer clamping ring, as hereinafterexplained.

It further consists in a novel construction of the packing-ring, wherebyit has an annular wedge or key formed upon it, insuring its retention bythe rings and plates forming the piston, as hereinafter explained.

In the accompanying drawings, A represents the perforated disk formingthe baseplate of the piston, made, preferably, in the form of a ringflat on its upper face, on which the packing-ring B rests, and connectedby radial arms with a central hub, similar in form to the inner ring, A,(shown in. plan View, Fig. 3,) but with the ring made broad and flat, asshown in Fig. 1. The inner ring, A,may be made either in the form of ashort cylinder having parallel sides, or it may be made slightlytapering downward to conform to the shape given to the inner face of thepacking-ring B, the inner face or walls of which may be made straight orparallel, or slightly converging toward the lower side of the ring, aspreferred, so long as the inner ring, A,is made to snugly fill thepacking ring at its lower end. The

(No model.)

outer face or periphery of this packing-ring is made to taper slightlyfrom its upper side or end, and near its lower end it has an annulargroove or depression formed in it at 1), (shown in the present instancemade in V shape in section,) in such manner that the portion of the ringbelow the central line of said groove is is made to assume the form ofan. annular wedge, B, havingits point or apex at the central line ofsaid groove 1), with its sides diverging thence downward to or near thelower end of the ring, as shown. Within the groove thus formed is placeda metal clamping-ring, G, conforming on its inner face to the shape ofthe groove I) and fitting snugly therein, the rubber packing-rin g beingheld firmly engaged with the clamping-ring by the inner ring or disk, A.

D is thevalve, E the nut on the end of the pump-rod, and F the screw foruniting the parts of the piston thereto and to each other,

these last-named parts being similar in construction and arrangement tothe corresponding parts in my former patent referred to; or, instead ofclamping the plates A and A together by said screw and nut, one of saidplates or rings may be provided with a threaded annular flange and theother with a threaded socket for uniting said parts and clamping thepacking-ring in place, the piston, as a whole,

being connected, in such case, with the pump rod by the screw and nut,as shown, or in any other suitable manner.

By the construction described and shown it will be seen that when thepacking-ring is in place between the rings 0 and A, and the latter isclamped or united to the base A, the ring B will be firmly grasped andheld by means of the annular wedge B, and accidental displacement of thesame when in use will be effectually prevented.

Having now described my invention, I claim- 1. The combination, in apump-piston, of the flat perforated base, the annularly grooved rubberpacking-ring, the outer clamping-ring, and the inner perforated disk orplate for bolding the packing-ring engaged with said clamping-ring,substantially as described.

2. The rubber packing-ring, made straight or slightly tapering on itsinner face, and hav- In testimony whereof I have hereunto set ing theannular groove or depression formed my hand this28th day of December,AD. 1880. upon its outer face, the portion of said ring below thecentral line or bottom of said groove WILLIAM LURLINGHAM' 5 ordepression being made in wedge shape, WVitnesses:

forming a key for retaining the packing-ring J. M. YZNAGA,

in place, substantially as described. ALEXR. MAHON.

